You may ask... why???
The reason is bloody simple! There are so few of them.
As a DD or BB, you have little impact on game since there are so many other BBs and DDs. As a CA you only have to be better than the other CA, thus improving odds of winning!
Prove me wrong :P

With legendary module, they have equalish range (groz has like 300m more). Without it Khab has much less range.
Khab has 3.5 knots on Groz, much more?
Armor, sure, but it also eats BB pens like no tomorrow, Groz doesn't.